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JAMES BOYD, OF MAMARONECK, NEW YORK, ASSIGNOR TO HIM- SELF AND N. C. GARRETSON, OF NEW YORK CITY.

Lette/'m Patent No. 84,530, dated December 1, 1868.

The Schedule :eferre to in these Letters Patentand making part of the same.

To all whom 'it may concern .will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this speciiieation.

Figure 1 represents a detail front elevation of a window-blind, provided with .my improved fasteningdevice.

Figure 2 is a vertical section of the same, taken on the plane of the line :r-x, iig. 1.

Figure 3 is a detail horizontalsection of the same, taken on the plane of the'line y y, iig. l.

Similar letters of reference indicate vcorresponding parts. i

This invention relateskto a new device for locking slats of Venetian window-blinds in any desired`position, soA as to obtain a certain desired quantity of light 1n a room.

The invention consists in the use of a crank-arbor, connected with the slat-rod, and provided with a lever, thatis, by a spring pressed against tlie edge of a notched or corrugated plate.

By fitting the leverinto anyone ofthe notches, the arbor will be locked, and will also lock the slats. To bring the-lever into another notch,'it must move in a horizontal direction, and for'tha't purpose the arbor is made sliding in itsv bearings.

The invention consists also in a new manner of hanging the slats, in place of the ordinary tenons formed in the same. I put a wire rod through each slat, the ends lof thewire projecting beyond the ends of the slat,

which ends serve to support the siat in the frame -of the blind.

-This manner of hanging the slats is considerably cheaper, simpler, and stronger than that now generally practised.

A, inthe drawing, represents the frame of a windowblind, known as Venetian blinds.

B B are the slats of the blind.

Through each slat is tted a wire or other r0d,c, the ends of which project beyond the ends of the slat, and serve to pivot the same to the frame, as is clearly indicated in g. 1.

O is the rod connecting the slats. This. rod is of suitable construction, and is either attached to the ends of the slats, as shown, or to the middle, as usual.

D represents a metal or other plate, fastened to the face of one of the uprights 'of the frame A.

From it project two ears, E and F, which serve as bearings for a horizontal crank-arbor, G, the crank-pin b of which' tits into the rod O, or into the end of one ofthe slats B, or into a plate or device secured to one of the slats.

From the arbor G also projects a lever, H, which is, by means of a spring, I, pressed against a corrugated or notched ridge, c, formed on the face of the plate E, as shown in igs. l and 3.

By putting the lever into one of the notches, the arbor will -be locked, so that it vcannot turn, and the vslats will consequently also be locked'in the desired position.

To take the lever out of a recess, it must be raised over the projections between the recesses,` and, to al-y low such motion, the arbor is made sliding in its bearings.

I claim as new, and desire .to secure by Letters Patent- The Slat-fastening device, consisting of the sliding crank-arbor G, held in the ears E and F, and combined with the lever H, spring I, and notched ridge c, all made and operating substantially as herein shown and described.

Witnesses:

WM. F. McNnMARA, ALEX. F. Renners.

JAMES BOYD. 

